The placenta separates from the uterus during the third trimester of pregnancy.
In abruptio placentae {ablatio placentae) the placenta separates from the lining of the womb before the usual time. Bleeding and pain are experienced at the point of separation, and the womb undergoes constant contraction. Severe cases involve shock. The condition is often associated with high blood pressure or ‘pre-eclampsia. If the neck of the womb is firm and undilated, a live fetus may be delivered by cesarean section.
The medical term used to describe the detachment or separation of one structure from another is known as avulsion.